29344 bearing: complete specifications & equivalents
The 29344 is a ISO 104 radial bearing sized 220 x 360 x 85 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 360 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1540 kN |
| Basic static load rating C0 | 5200 kN |
| Fatigue load limit Pu | 360 kN |
| Limiting speed (mechanical) | 940 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 34500 g |
| Manufacturer designation | NTN 29344 |
| Standard | ISO 104 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 29300-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 3.346 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in 29300-series | 85 mm |
| Largest outer diameter in 29300-series | 1180 mm |
| Width range across 29300-series | 39–230 mm |
| Bore position in 29300-series (smallest first) | 14 of 31 |
| Bore above smallest 29300-series size | 135 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29344-E | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×360×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 29344 model number is decoded
From the medium-section 29300 spherical-thrust family, 29344 measures 220 mm through the shaft washer, 360 mm over the outside and 85 mm in assembled height. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 44 encodes the 220 mm bore (bore code x 5). Catalogue mass is about 35 kg for the full washer-and-roller stack. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running.
Typical equipment & failure modes
Common applications
- heavy rolling-mill and forging-press thrust seats
- large marine propulsion thrust supports
- crane and excavator main slew bearings duty
- rotary kiln and furnace thrust positions
Known failure patterns
- edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite
- oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage
- roller skid smearing when axial load fell below the minimum while the shaft was still turning fast
- thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation
- fretting on the shaft seat after the washer crept under reversing axial shock
Selection pitfalls — read before you substitute
- At 220 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.
- The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 220 mm bore.
- Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29344 was chosen for.
- Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29344 stack as a set.
- The 85 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.
- The Ca 1540/C0a 5200 kN ratings and 360 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29344; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 29344?
29344 is a spherical roller thrust bearing to ISO 104: 220 mm shaft-washer bore, 360 mm outside diameter, 85 mm stack height (8.661 x 14.173 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1540 kN, C0a 5200 kN and a 360 kN fatigue load limit Pu; limiting speed 940 r/min with oil lubrication; mass about 34500 g.
How is the 29344 designation structured?
293 is the dimension series (medium-section 29300 spherical-thrust family); 44 encodes the 220 mm bore (bore code x 5). The 360 mm OD and 85 mm height follow the ISO 104 boundary plan for that series.
Can 29344 handle misalignment and radial load?
Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing.
Why does NTN print only an oil speed, 940 r/min, for 29344?
Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run.
What should be checked before substituting another make for 29344?
The 220/360/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1540 kN / C0a 5200 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.